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Extend Backends class to filter backends by capabilties

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This commit is contained in:
Stein Magnus Jodal 2012-11-12 21:41:02 +01:00
parent 0b25a6f11f
commit 429e87fe6e
1 changed files with 22 additions and 2 deletions
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24
mopidy/core/actor.py
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@ -58,10 +58,18 @@ class Backends(list):
def __init__(self, backends):
super(Backends, self).__init__(backends)
# These lists keeps the backends in the original order, but only
# includes those which implements the required backend provider. Since
# it is important to keep the order, we can't simply use .values() on
# the X_by_uri_scheme dicts below.
self.with_library = [b for b in backends if b.has_library().get()]
self.with_playback = [b for b in backends if b.has_playback().get()]
self.with_stored_playlists = [b for b in backends
if b.has_stored_playlists().get()]
self.by_uri_scheme = {}
for backend in backends:
uri_schemes = backend.uri_schemes.get()
for uri_scheme in uri_schemes:
for uri_scheme in backend.uri_schemes.get():
assert uri_scheme not in self.by_uri_scheme, (
'Cannot add URI scheme %s for %s, '
'it is already handled by %s'
@ -69,3 +77,15 @@ class Backends(list):
uri_scheme, backend.__class__.__name__,
self.by_uri_scheme[uri_scheme].__class__.__name__)
self.by_uri_scheme[uri_scheme] = backend
self.with_library_by_uri_scheme = {}
self.with_playback_by_uri_scheme = {}
self.with_stored_playlists_by_uri_scheme = {}
for uri_scheme, backend in self.by_uri_scheme.items():
if backend.has_library().get():
self.with_library_by_uri_scheme[uri_scheme] = backend
if backend.has_playback().get():
self.with_playback_by_uri_scheme[uri_scheme] = backend
if backend.has_stored_playlists().get():
self.with_stored_playlists_by_uri_scheme[uri_scheme] = backend